Device for locking and driving bobbins on spindles



Sept. 27, 1960 E. COLOMBU ET AL 2,954,249

DEVICE FOR LOCKING AND DRIVING BOBBINS ON SPINDLES Filed Jan. 21, 1959 Attorney aterrt DEVICE FOR LOCKING AND DRIVING ROBBINS N SPINDLES Eugene Colomhu and Henri Chapuis, Paris, France, assignors to Chimiotex Societe Anonyme, Geneva, Switzerland, a corporation of Switzerland Filed Jan. 21, 1959, Ser. No. 788,233

Claims priority, application France Jan. 23, 1958 1 Claim. (Cl. 287-52) This invention relates to a device for locking and driving bobbins on spindles.

Centering cores for centering the winding supports, such as bobbins, tubes, etc. on spindles as heretofore used generally consist of metal and are fairly costly by reason of the machining cost.

An object of the present invention is to provide a device of the above type which is light in weight, durable, and is relatively inexpensive.

A more specific object is to provide such a device which is made from a casting of light Weight, low cost, metal.

The invention will be more readily understood from the following description taken in connection with the accompanying drawing wherein Fig. 1 is an elevation partly in section illustrating the invention as applied to a device for locking and centering a spool on a throwing spindle; and

Fig. 2 is a similar view illustrating an element for a cop tube on a continuous twisting spindle of the ring and traveller type.

According to the present invention, members consisting of pressure cast alloy are employed. This casting, which is preferably eflected from an inexpensive alloy, known under the trade name Zamak and containing 95% zinc, 5% aluminum or 4% aluminum and 1% copper, permits of producing centering cores of relatively complex form in a small number of parts.

Although the elements are of small thickness, they are very robust and lightness of the assembly is extremely important, since the use of heavy members raises the center of gravity of the spindle and modifies the conditions of rotational equilibrium.

In Fig. 1 the core comprises three shoes (called tips in the textile industry), and in Fig. 2 four shoes.

According to Fig. 1, the core which is mounted on a spindle 10 is composed of a pair of members each having a hub 1, and a cap 2 terminating in a peripheral flange 7. The hubs 1 are secured together as by crimping at 3 to form a unitary structure. The huh I is formed with three radial cavities or compartments 4, one of which is shown and which are defined by radially extending fins on the hub which are shown by numeral 12' in Fig. 2, for example Each cavity contains a shoe 5 having an internal cavity 6. The shoe has a surface 11 hearing against the inner surface of the flange 7. A spring 8 working in compression is disposed within the cavity 6 of the shoe. The shoe is provided with a lip 9 which extends slightly beyond the flange 7 and is adapted to engage the inner surface of the core of a bobbin. The springs 8 working in compression therefore cause the shoes 5 to grip the bobbin, but on rotation of the spindle '10 on which the centering core is fitted the centrifugal eifect further increases the gripping action.

The core of Fig. 2 is similar, but comprises four shoes. The numbering is the same as in Fig. 1 with primes added.

What is claimed is:

A core for centering and locking a bobbin on a spindle, comprising a hub member having ends and an intermediate section adapted to seat on a spindle, a cap having an annular flange carried by one end of said hub memher, a second cap having an annular flange carried by the other end of said hub member, the intermediate section of said hub member having a plurality of radially extending fins spaced to form arcuate compartments therebetween, a shoe having a radial cavity disposed in each of said compartments and centered between the annular flanges of the two caps, a compression spring in said radial cavity of each shoe engaging said hub to hold said shoe in extended position, each shoe having an outer surface adapted to seat against said flanges and having a lip projecting radially beyond said flanges adapted to engage said bobbin for centering and securing the same.

References Cited in the file of this patent UNITED STATES PATENTS 2,835,517 Beerli May 20, 1958 FOREIGN PATENTS 1,034,953 France Apr. 15, 1953 

